add interactivity to published report?

I have a published report, running fine in app.powerbi.com

I wanted to make a quick change, directly in the workspace; I want to add a simple forecasting (the same way its done in Excel).

That is; I want to make it interactive… Ideally, the user can changes numbers; the same way in excel you can “forecast” X by changing the number of Y.

Is PowerBI set up for that? Or is it only for data visualization?